From: Kenneth Graunke <kenneth@whitecape.org>
Date: Thu, 22 Jul 2010 03:24:29 +0000 (-0700)
Subject: ir_constant_expression: Add support for the "reflect" builtin.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d60b2b03da30093ae85458f1d0be3cc5c33d992c;p=mesa.git

ir_constant_expression: Add support for the "reflect" builtin.
---

diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp
index 809ea609a3d..c8320814a3e 100644
--- a/src/glsl/ir_constant_expression.cpp
+++ b/src/glsl/ir_constant_expression.cpp
@@ -1013,7 +1013,10 @@ ir_call::constant_expression_value()
       for (unsigned c = 0; c < op[0]->type->components(); c++)
 	 data.f[c] = M_PI/180.0 * op[0]->value.f[c];
    } else if (strcmp(callee, "reflect") == 0) {
-      return NULL; /* FINISHME: implement this */
+      assert(op[0]->type->is_float());
+      float dot_NI = dot(op[1], op[0]);
+      for (unsigned c = 0; c < op[0]->type->components(); c++)
+	 data.f[c] = op[0]->value.f[c] - 2 * dot_NI * op[1]->value.f[c];
    } else if (strcmp(callee, "refract") == 0) {
       return NULL; /* FINISHME: implement this */
    } else if (strcmp(callee, "sign") == 0) {